Drilling apparatus



E. G. GARTIN DRILLING APPARATUS Filed oct. 2e.

oct. 25, 1932.

um @SN N i Patented :i j ELMER `My' invention rela and particu steels.

drills.

to ,devise an structionitwhioh l j Another `obj ect of oa', 2s, i 1932 ce GARLIN, or ctnnnmonn isaiasi NEWV HAMPSHIRE; ASSIGNOR 'ro suLmvAN ai coRroRa'rroN or iunssnonns'nr'rs nRInLIfNG Ariiinntrs is an object of my invention to provide V improvedretainer constructionwfor rock A Afurther objectief :the invention is improved drill steel retainer conybe easily manufactured. my invention is to provide animproved construction for drill steel tainers having imp t the retainer o 131011; if A i proved sel j parts `Toi? the Vretai Other. objects t an tion `Will hereinafter `more Yfully appear.

shown for au which the invention In the drawingf# Fig; llillustrates'` side of improved detailsof construction j The rockfdrill `with which I Ahaveshovvn improved retainer "construction associe atedfiinay be of a well known construction having a'chuck housing'l held in assembled ation With a cylinder 2iby means `03E side rods yvvhich exert a resili on the sections of the rock rel springs 4` assembled i drill steel end` of the chuck 4hou vvith a collar v6 fform `The j retainer comprises arms 7 and 8 with a U thefrontend Which is j H permit' freedom of movementof the drill" ssage `of the" collar 6. ed adjacent the`opensteel `the front end ofa rock but prevent the pa oulder 10 is` provid accompanying .drawing- I have of illustration one form may assumein practice.

purposes relation. 5 `is loosely testo apparatus larly to retainers for rock drill roved means for holding perative or inoperative Aposi still further 1 object is Ito i provide imf-lockingmeans for holding the ner in assembledfrelation; j dA` advantages of the invenelevational view drill having my i retainer `construction associated Ttherewith.` t i 'l i "FigfQ is right angles parts shown an elevationjofthe rock drillat i to the vievvshownlin Figilpvvith in `section to facilitate illustra` enty clamping force drill through to hold the `different t sections, in Wellknown formof mounted inthe front sing: and is provided ed integral therewith. ayokel-having Iside -Shered Opening 9 in `of a size'adapted to ing 9'With which the collarfon the drillsteel tion having the features .just `describedl is old "One feature" directedto novel: means for yokeonft'he "chuck housing atprevioiis Construction the yoke Lvvas provided With cylindrical portions which Were adaptedto i pivoting this formed in lugs integral vvlithfthechuckhousing"` Now?, it hasbeen found in actual practice that the milling cfa recess having an arcuate bearing surface in a relatively small detachable member suchas a milch moresimple matter than the forming of a recess h ing surface ina lng integral With the chuck housing.` Accordingly the present construction has `been devised `plojfed a pair of diametrically positioned cylindrical trunnions 11 and 12 'on-the chuck Vhousing"n 7hichmay be machining. VLEach of theretainer yoke is provided 'with a semicylindric'al arcuate recess 13 Which is adapted to beheldin engagement'with ythe trunnions tion.y i t j l t t 11 and 12l in the normalposition of the rev t Fig. is 'aftransverse section on line 3-3 taiiier. For this purpose thearms 7 and 8 o i u ofFig; 1,` Withwparts broken away tolshow are `fcfirmed with inwardly projecting lugs 14 and lrespectivelylvvhich are engaged by an annular collar 16 slidably mounted on the chuck housing.` `The collar 16 is resiliently held against the means of a coiled' spring 17 surrounding the chu'ck housing and a suitable nut 18 isV threadedjonfthe end ofthe chuck housing for holding the spring and other parts in place.

such as the holes 19 Ato receive a Wrench for the purpose ofadjusting the mit to obtain the desircdtension on spring `17.- i

operative or `inoper and 15 fareeach provided With `flat surfaces 2O and 21,the surfaces 20' being adaptedto engage jthe: collar 1d tvheii' `the retainer is' heldin `inoperative position and the surface 2'1 "being adapte engages. A pivoted yoke retainer constru'c-v of the `present invention is beypivotally mounted in arcuate "recesses a i ythe retainer yoke g3 aving asmooth arcuate bearwherein there is em- Y formed with suiiicient 'i accuracy by ak dieV forging process Without thearmsiland 8 of 75 projections 14 and 15 by 35 The nut 18 is provided with suitable means o()` For `the purpose of holding the retainer in Vj ativ'e position the flugs 14 ha d to engage` the coll-ar 16 tou when the retainer is in normal operative position.

rllhe .improved means for locking the parts of the retainer in assembled relation will now be described. The periphery of the collar 1G has at its opposite sides flat portions 22 shown in Fig. 3 which are adapted to cooperate with the arms 7 and 8 of the retainer yoke to prevent rotation of the collar relative to the housing. This colla 1 also has an integral lug 28 (see Fig. 2) engaging in an arcuate groove 2li in the spring 17 to prevent relative rotation between the spring and collar. A second collar 25 is mounted between the spring and ring 18 and has similar lugs 26 and 27 engaging in suitable arcuate recesses in the forward end of the spring and in the threaded ring respectively. The ring 18 cannot therefore work 'loose since it is locked against rotation relative to the spring 17 and the spring in turn locked to the chuck housing by lugs 23 and collar 16. The shape of the lugs 26 and 27 is however such as to permit intentional movement of the threaded ring by means of a wrench applied tothe ring.

In the use of this device, when it is desired to remove a drill steel, the operator moves the retainer to the dotted line position shown in Fig. 1, the arms 7 and 8 swinging on the pivots 11 and 12 and the compression of spring 17 acting on the collar 16 will resiliently hold the retainer yoke in the position illustrated. TWhen the dull steel has been replaced by a resharpened one, the retainer is swung into full line operative position with the surface 2l bearing on the collar which serves to hold it in operative position. The drill steeel is effectively prevented from dropping out of the chuck housing by means of the collar 16 engaging the shoulder 1() on the retainer yoke. If the hammer mechanism of the drill is operated while the drill steel is not bearing against the work, the blow will be transmitted through the collar on the drill steel and the retainer yoke to the spring 17, where it will be effectively cushioned to prevent breakage of the retainer or other parts.

IWhile I have in this application specifically described one form which my invention may assume in practice, it will be understood that this form of the same is shown for purposes of illustration and that the invention may be modified and embodied in various other forms without departing from its spirit or the scope of the appended claims.

Vxhat I claim as new and desire to secure by Letters Patent is:

1. In a rock drill, a chuck housing` having cylindrical lugs projecting laterally therefrom, a retainer yoke pivotally mounted on said chuck housing and having arcuate bearing surfaces cooperating with said lugs, and means'for resiliently maintaining said bearing surfaces in engagement with said lugs comprising an annular member surrounding said chuck housing and engaging said yoke and yielding means for holding said member against said yoke and for holding said bearing surfaces in contact with said lugs.

2. In a rook drill, a chuck housing having cylindrical lugs projecting laterally therefrom, a retainer yoke pivotally mounted on said chuck housing, the arms of said yoke having arcuate bearing surfaces engaging said lugs, and means for resiliently maintaining said bearing surfaces in engagement with said lugs comprising an annular member surrounding said chuck housing and engaging said yoke, a retaining member secured to said chuck housing and a spring interposed between said annular member and said retaining member.

3. In a rock drill, a chuck housing having cylindrical trunnions projecting laterally therefrom, a retainer yoke pivotally mounted on said chuck housing and having arcuate bearing surfaces engaging said trunnions, a pair of inwardly directed lugs on the arms of said yoke adjacent said arcuate bearing surfaces, a collar surrounding said chuck housing and engaging said inwardly directed lugs, and means for resiliently holding said collar in engagement with said lugs and said recesses in contact with said trunnions.

t. In a rock drill, the construction defined in claim 3 wherein said inwardly projecting lugs are provided with a plurality of flat surfaces in angular relation, said collar adapted to bear against a pair of said surfaces to hold said retainer in operative or in inoperative position.

5. In a rock drill, a chuck housing having cylindrical trunnions projecting laterally therefrom, a retainer yoke having spaced arms with'rearwardly opening arcuate recesses in the ends of said arms, one of said trunnions being received in each of said recesses, inwardly directed lugs integral with said yoke arms adjacent said bearing surfaces, a collar slidably mounted on said chuck housing and engaging said inwardly directed lugs, a spring surrounding said chuck housing in contact with said collar, and a ring secured on the end of said chuck housing for placing said spring under compression and holding said yoke against said trunnions.

-6. In a rock drill, a chuck housing having laterally projecting lugs, a drill steel loosely mounted in said chuck housing, a retainer yoke for said drill steel having a pivotal connection to said lugs, means for resiliently holding said yoke against said lugs including a collar surrounding said chuck housing, a spring, a retaining nut threaded on said chuck housing, means for preventing rotation of said collar, and cooperating means o said collar andnut forv locking the latter against accidental movement.

7., In a rock drill, achuck housinghaving" laterally projecting lugs, a drillsteel loosely mounted in said chuck housing, a retainer yoke for said steel having means to provide a pivotal connection withsaid lugs, means f for resiliently holding said yoke against said lugs including a retaining nut threaded on the end of said chuckfhousinga collar slidably mounted on said chuck housing, yielding means acting upon said retainer yoke and i yieldingly holdingrsaid collar against said i A nut, meansfor locking said collaragainst ro- 15 tation, anda cooperating lug and recess on saidcollar and nut to lock the latter against accidental movement.

` 8. In a rock drill, a chuck housing having laterally projecting lugs, a'drill steel loosely mountedin said chuck housing, a retainer yoke for said steel having means to provide a pivotalconnection with said lugs, means j for resiliently holding said yoke against said lugs including a retaining nut threaded on the end of said chuck housing, a springsur-4 rounding the chuck housing between said nut and said lugs, means for preventing relative rotation between said spring and said. chuck against said lugs including a retaining ele-` ment secured on the end of said chuck housv Yhonsing,`and meansfor. locking said nut to i said spring to of said nut. j j l j i j Y ,19, In a rock drill,\a chuckyhousing having prevent accidental movement j i laterally projecting lugs, a drill steel; loosely mounted in said chuck housing, a retainer yoke for said drill steel having a pivotal connection to said lugs, means for resiliently` holding said yoke against said llugs including a collar surrounding said chuck housing, a spr1ng,`a retaimng element secured on said chuck housing, means for preventingrotation,`

of said collar, and cooperating means on said collarand retaining element for locking the latter against accidental movement. a

l0.` In a rock drill, a chuck housing having laterally projecting lugs, a drill steel loosely mounted in said chuck housing, a retainer yokefor said steel havingmeans to provide a" pivotal connection with said lugs, means for resiliently holdingsaid yoke `againstsaid lugs including a retaining element secured on the end offsaid chuck housing, a collar j slidably mounted on said chuck housing,

yielding means acting upon said, retainer yoke and yieldingly holding said collar against said retaining element, means `for locking said collar against rotation, and a cooperating lug and recess on saidcollar and retaining elementl to lock the latter against accidental movement.V u 1l. Ina rock drill, a chuck housing hav ing laterally projecting lugs, a drillsteel` loosely mounted in said chuck housing,a retainer yoke for said steel having means to provide a pivotal-,connection with said lugs, meanslffor resiliently holding said `yoke 

